Heavy bill
ADULT
Round nostrils
Long 7th
ADULT
Dark coverts
Short tail
Rectangular wings
Short
Paler than coverts
Darker than flight-feathers
Long 7th
IMMATURE
Single comma
Long 7th
Dark coverts
Pale flight feathers
IMMATURE
Heavy bill
IMMATURE
Dark coverts
White spots
Long 7th
White tips
White band
IMMATURE
Short
Heavy
